week
/wiːk/noun
1- a period of seven days星期, 周：
the course lasts sixteen weeks
该课程持续16个星期
he'd cut the grass a week ago.
他一个星期前割了草。
1.1
- the period of seven days generally reckoned from and to midnight on Saturday night（两个星期六夜晚之间）七天的时间, 周：
she has an art class twice a week.
她每周上两次艺术课。
1.2
- workdays as opposed to the weekend; the five days from Monday to Friday工作日（指星期一到星期五）：
I work during the week, so I can only get to this shop on Saturdays.
我工作日得上班, 所以只有星期六才能来这个商店。
1.3
- the time spent working in this period一周工作时间, 工作周：
she works a 48-hour week.
她每周工作48个小时。
1.4
- informal, chiefly Brit. used after the name of a day to indicate that something will happen seven days after that day〈非正式, 主英〉（从某天算起）七天之后：
the programme will be broadcast on Sunday week.
节目将在下周星期天播出。
短语
a week on -
- used to state that something is due to happen seven days after the specified day or date某个日子七天之后：
we'll be back a week on Friday.
我们一周之后的星期五返回。
week in, week out
- every week without exception一周又一周, 一星期又一星期地。
词源
Old English wice, of Germanic origin; related to Dutch week and German Woche, from a base probably meaning 'sequence， series'.